CN105771882A - Bentonite particles, bentonite particle adsorption column and method for removing ammonia nitrogen - Google Patents
Bentonite particles, bentonite particle adsorption column and method for removing ammonia nitrogen Download PDFInfo
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- CN105771882A CN105771882A CN201610247798.9A CN201610247798A CN105771882A CN 105771882 A CN105771882 A CN 105771882A CN 201610247798 A CN201610247798 A CN 201610247798A CN 105771882 A CN105771882 A CN 105771882A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
- B01J20/12—Naturally occurring clays or bleaching earth
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
- B01J20/28014—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their form
- B01J20/28016—Particle form
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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Abstract
The invention belongs to the technical field of water treatment, and particularly relates to bentonite particles, a bentonite particle adsorption column and a method for removing ammonia nitrogen. Bentonite is modified to obtain the modified bentonite particles, the modified bentonite particles are used as a filler to obtain the bentonite particle adsorption column, and ammonia nitrogen in a water body is removed by the bentonite particle adsorption column. The ammonia nitrogen removing technical scheme which is convenient, effective, appropriate in cost and high in practicability is provided for the problem that the content of ammonia nitrogen in the eutrophic water body is high.
Description
Technical field
The invention belongs to water-treatment technology field, be specifically related to a kind of remove the bentonite clay particle of ammonia nitrogen, bentonite clay particle adsorption column and method.
Background technology
Along with the fast development of Chinese society, the continuous push belt of urbanization process carrys out the problems such as size of population increase, industrial sector popularization, and the lake of surrounding city, river etc. assume responsibility for major part sanitary sewage, industrial wastewater.But, owing in sewage, the content of nitrogen and phosphorous is too high so that after natural water body receives all kinds of waste water, its nutritive salt load exceeds standard, cause the amount reproductions such as Measures of Algae in Water Body biology, and then cause body eutrophication, accelerate water body aging.
Natural water body ammonia and nitrogen pollution has its feature: the water yield is big but concentration relatively industrial wastewater is low.At present, the wastewater processing technology key factor of low-concentration ammonia-nitrogen is two big classes: one is physical chemistry technology, including break point chlorination, ion exchange etc.；Two is bio-denitrification technology, after namely making the organic nitrogen in waste water be converted into ammoniacal nitrogen by various microbial actions, is translated into nitrogen then through serial reactiones such as nitrated, Denitrifications and enters air, be finally reached denitrogenation purpose.Although these methods ammonia nitrogen in removing water has certain effect, but is all clearly present relatively costly, floor space is big, the problems such as operational management is cumbersome, it is difficult to large-scale promotion application.Therefore developing a kind of easy and simple to handle, cheap, effect obvious ammonia nitrogen removal method is very necessary.Removing the ammonia nitrogen in water body is the key solving body eutrophication problem, therefore provide a kind of convenient effectively, suitable, the practical denitrogenation method of cost highly significant.
Summary of the invention
For solving the deficiencies in the prior art, the invention provides and a kind of remove the bentonite clay particle of ammonia nitrogen, bentonite clay particle adsorption column and method.Bentonite is as natural minerals, originate wide, cheap, utilize starch to fire balling-up, then modifiied, not only ammonia nitrogen absorption is effective, and easily realize solid-liquid separation, it is also used as fertilizer simultaneously and goes back to field and carry out secondary utilization, therefore there is stronger practical value, can effectively solve body eutrophication problem, improve water environment.
A kind of bentonite clay particle removing ammonia nitrogen, is obtained by bentonite modified.
Concrete, alta-mud modification method comprises the following steps:
1) ratio that bentonite and starch are 100:2～4 in mass ratio being mixed, the mix homogeneously that adds water is twisted into bead, and at 480～550 degrees Celsius of lower roasting 4～6h, bead is made granular adsorbent after drying.
2) by step 1) granular adsorbent that obtains is modified in calcium chloride solution, and modifiy with pure water clean, obtained bentone soil particle.
Concrete, step 1) in: the particle diameter of bead is 3～5mm；The baking temperature of bead is the thermostat temperature of 90～110 degrees Celsius；The drying time of bead is 1.5～2.5 hours.
Concrete, step 2) in: the amount ratio of granular adsorbent and calcium chloride solution is 4～6g/100mL；The concentration of calcium chloride solution is 0.08～0.11mol/L；Modification time is 30～50min；Modifying process carries out in shaking table, and rotating speed is 100～140r/min.
Natural montmorillonite is modal a kind of clay mineral on the earth, and main component is montmorillonite.The crystal structure of montmorillonite is by upper and lower two-layer silicon-oxy tetrahedron, the clay mineral of the three layers laminated structure that middle alumina octahedral forms.Bentonite has good dilatancy, adsorptivity, cation commutativity and bigger inside and outside specific surface area, so bentonite has very strong ammonia nitrogen absorption ability.
Although it is pulverous bentonite high adsorption capacity, effective, but it has very strong swellability, easy blocking device, and Powdered bentonite sedimentation function is poor, solid-liquid separation it is difficult to after adsorption treatment, therefore the present invention utilizes starch that bentonite is carried out pelletize, improves follow-up solid-liquid separation effect.Simultaneously in order to improve bentonitic utilization rate further, with calcium chloride, granule bentonite is modified, improves the bentonitic ammonia nitrogen removal effect of granule further.
Present invention also offers a kind of bentonite clay particle adsorption column removing ammonia nitrogen, including tubular carrier, it is filled with bentonite clay particle section in the stage casing of described tubular carrier, it is separately filled with layer glass layers of balls outside the two ends of described bentonite clay particle section, outside the glass spheres described in two-layer, it is separately filled with layer glass cotton layer, outside the glass cotton layer described in two-layer, is respectively arranged with two fixing plugs.
Concrete, described tubular carrier is glass tubing, lucite tube, plastic tube or metal tube.
Concrete, described fixing plug is rubber stopper or stopper.
Concrete, described bentonite clay particle section is made up of bentonite clay particle and/or bentone soil particle.
Preferably, described bentone soil particle is above-mentioned bentone soil particle provided by the present invention.
Present invention also offers the method removing ammonia nitrogen:
Method one: the bentonite clay particle of above-mentioned removal ammonia nitrogen provided by the present invention is dispersed in containing in ammonia nitrogen water.
Concrete, with in every 4～6g modified alta-mud Granular composite to 100mL water, vibrate 1～1.5h, adsorbs.
Method two: the water containing ammonia nitrogen is flowed through the bentonite clay particle adsorption column of above-mentioned removal ammonia nitrogen provided by the present invention.
Preferably, the bentonite clay particle adsorption column removing ammonia nitrogen is vertically arranged, and current flow through bentonite clay particle adsorption column from bottom to top, carry out adsorption treatment.
Concrete, the hydraulic detention time (HRT) of bentonite clay particle adsorption column is 0.8～1.2h.
Bentonite itself is soil conditioner of good performance, it not only has stronger fertilizer conservation water retention property, and the buffer capacity of soil can also be improved, therefore ammonia nitrogen absorption saturated after bentonite clay particle can return field as fertilizer obtain further with, efficiently solve the problem of outlet of adsorbent.
Beneficial effect
Bentonite has good dilatancy, adsorptivity, cation commutativity and bigger specific surface area, so bentonite has very strong ammonia nitrogen absorption ability.Although Powdered bentonite adsorption is effective, but it has certain swellability, therefore equipment blocking is easily caused, the present invention adopts interpolation starch to make bentonite cause granule, is subsequently filled in pillar and removes the ammonia nitrogen in water body, and effect is notable, simple to operate, utilize the modified ammonia nitrogen removal better effects if of calcium chloride, and easily realizing solid-liquid separation after absorption, do not affect the subsequent treatment of water body.Meanwhile, phosphate radical is also had certain removal effect by it.And bentonite itself or well-behaved soil conditioner, therefore the bentonite clay particle after absorption ammonia nitrogen can go back to field as fertilizer, has the value that secondary utilizes.Generally, the concentration of ammonia nitrogen in water can substantially be reduced by technical scheme provided by the present invention.
Accompanying drawing explanation
Fig. 1 is the structural representation of the bentonite clay particle adsorption column of removal ammonia nitrogen provided by the present invention.
Fig. 2 is the concrete system diagram carrying out water process with the bentonite clay particle adsorption column of removal ammonia nitrogen provided by the present invention.
In accompanying drawing 1,2, the list of parts representated by each label is as follows:
1, bentonite clay particle section, 2, glass spheres, 3, glass cotton layer, 4, rubber stopper, 5, intake chamber, 6, peristaltic pump, 7, bentonite clay particle adsorption column, 8, effluent trough.
Fig. 3 is the different types of bentonite effect block diagram to ammonia nitrogen absorption.
What Fig. 4 was ammonia nitrogen initial concentration on modified and unmodified bentonite clay particle absorption ammonia nitrogen affects string diagram.
Detailed description of the invention
Hereinafter principles of the invention and feature being described, illustrated embodiment is served only for explaining the present invention, is not intended to limit the scope of the present invention.
Embodiment 1
1) bentonite and starch are mixed by weight the ratio for 100:4, the mix homogeneously that adds water is twisted into the bead that particle diameter is 3mm, bead is dried 1.5 hours under the thermostat temperature of 110 degrees Celsius, makes granular adsorbent at 550 degrees Celsius of lower roasting 4h after drying.
2) by 6g step 1) granular adsorbent that obtains is modified in the calcium chloride solution that concentration is 0.08mol/L of 100mL, modifying process carries out in shaking table, modification time is 50min, shaking speed is that 100r/min modifiies, clean with pure water after having modifiied, obtain bentone soil particle 1.
Embodiment 2
1) bentonite and starch are mixed by weight the ratio for 100:2, the mix homogeneously that adds water is twisted into the bead that particle diameter is 5mm, bead is dried 2.5 hours under the thermostat temperature of 90 degrees Celsius, makes granular adsorbent at 480 degrees Celsius of lower roasting 6h after drying.
2) by 4g step 1) granular adsorbent that obtains is modified in the calcium chloride solution that 100mL concentration is 0.11mol/L, modifying process carries out in shaking table, and modification time is 30min, and shaking speed is that 140r/min modifiies, clean with pure water after having modifiied, bentone soil particle 2.
Embodiment 3
1) bentonite and starch being mixed by weight the ratio for 100:3, the mix homogeneously that adds water is twisted into the bead that particle diameter is 4mm, is dried 2 hours by bead, make granular adsorbent at 500 degrees Celsius of lower roasting 5h after drying under the thermostat temperature of 100 degrees Celsius.
2) by 5g step 1) granular adsorbent that obtains is modified in the calcium chloride solution that concentration is 0.10mol/L of 100mL, modifying process carries out in shaking table, modification time is 40min, shaking speed is that 120r/min modifiies, clean with pure water after having modifiied, obtain bentone soil particle 3.
Comparative example 1
The unmodified bentonite powder of 5g, 5gCaCl is added respectively in 4 triangular flasks2Modified bentonite powder, the unmodified bentonite clay particle of 5g, 5gCaCl2Modified bentonite clay particle, is then added to the ammonia nitrogen simulation water distribution of 100mL10mg/L, is placed on the shaking table that rotating speed is 120r/min and vibrates adsorbs 1 hour, the ammonia nitrogen concentration after adsorbing then through three layers filter paper filtering sampling and measuring.
Fig. 3 show the bentonite adsorption effect to ammonia nitrogen of different disposal.There it can be seen that modified is all significantly high to the adsorption efficiency of ammonia nitrogen with unmodified Powdered bentonite, it is possible to reach about 85%.But when experiment terminates, bentonite sedimentation velocity is slow, and the mud-water separation time is very long, and filter paper filtering speed is also very slow, in this experiment is three layers filter paper, if only with a metafiltration paper, filtrate still having bentonite, therefore, although Powdered bentonite ammonia nitrogen absorption is effective, but solid-liquid separation is difficult, it is impossible to meet emission request, also affect subsequent treatment simultaneously.
The adsorption effect of ammonia nitrogen is declined by the bentonite clay particle of same quality to some extent, and after this is primarily due to starch pelletize, although gross mass is constant, but specific surface area declines, so have impact on the adsorption effect to ammonia nitrogen.But, the water sample before and after absorption vibration of the bentonite after pelletize is all substantially clarified than the water sample of powder bentonite in treatment, and also can precipitate rapidly after standing, recovers clarification, compares with powder bentonite, be more beneficial for water outlet and directly discharge or subsequent treatment.
In order to improve the bentonitic adsorption effect of granule, use CaCl2It is modified, it can be seen that adsorption efficiency significantly improves, reaches 65%.
Comparative example 2
Laboratory preparation simulation ammonia nitrogen waste water, concentration is 2mg/L, 10mg/L, 15mg/L, 30mg/L respectively, respectively takes 100mL and is placed in triangular flask, is added to 5gCaCl respectively2Modified bentonite clay particle, is subsequently placed on shaking table under 120r/min rotating speed and vibrates adsorbs 1 hour, and sampling and measuring ammonia nitrogen value investigates the impact on graininess bentonite adsorption effect of the ammonia nitrogen initial concentration.Additionally compare experiment with the unmodified bentonite clay particle of 5g.
Specific experiment result as shown in Figure 4, there it can be seen that along with the rising of initial ammonia nitrogen concentration, the clearance of ammonia nitrogen is also more and more higher, the TAN that the bentonite of equal in quality adsorbs also gets more and more, and illustrates that ammonia nitrogen concentration is high, it is possible to improve the bentonite clay particle absorption power to ammonia nitrogen.And CaCl2The adsorption effect of ammonia nitrogen is substantially better than unmodified bentonite clay particle by modified bentonite clay particle, and CaCl is described2Modifiy and can significantly improve the bentonite absorbability to ammonia nitrogen.
Effect example 1
Packed column as shown in Figure 1 is made respectively with bentone soil particle 1, bentone soil particle 2, bentone soil particle 3, with the system shown in Fig. 2, Wuhan City's Lake Water is carried out purification of water quality test, adjust rotating speed and control hydraulic detention time HRT=1h, run continuously and monitor Inlet and outlet water ammonia nitrogen concentration.Table 1 show Inlet and outlet water ammonia nitrogen concentration during plant running 12h, it can be seen that, ammonia nitrogen concentration is reduced to about the 0.81mg/L of water outlet from about the 2.68mg/L of water inlet, hence it is evident that reduce, and its corresponding water quality classification also rises to the surface water Group III standard of water outlet from bad V class of water inlet.
Table 1 bentonite clay particle packed column is to the treatment effect of ammonia nitrogen in certain Lake Water
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all within the spirit and principles in the present invention, any amendment of making, equivalent replacement, improvement etc., should be included within protection scope of the present invention.
Claims (10)
1. the bentonite clay particle removing ammonia nitrogen, it is characterised in that: obtained by bentonite modified.
2. the bentonite clay particle of removal ammonia nitrogen according to claim 1, it is characterised in that: alta-mud modification method comprises the following steps:
1) ratio that bentonite and starch are 100:2～4 in mass ratio being mixed, the mix homogeneously that adds water is twisted into bead, and at 480～550 degrees Celsius of lower roasting 4～6h, bead is made granular adsorbent after drying；
2) by step 1) granular adsorbent that obtains is modified in calcium chloride solution, obtains bentone soil particle.
3. the bentonite clay particle of removal ammonia nitrogen according to claim 2, it is characterised in that step 1) in: the particle diameter of bead is 3～5mm；The baking temperature of bead is the thermostat temperature of 90～110 degrees Celsius；The drying time of bead is 1.5～2.5 hours.
4. the bentonite clay particle of removal ammonia nitrogen according to claim 2, it is characterised in that step 2) in: the amount ratio of granular adsorbent and calcium chloride solution is 4～6g/100mL；The concentration of calcium chloride solution is 0.08～0.11mol/L；Modification time is 30～50min；Modifying process carries out in shaking table.
5. the bentonite clay particle adsorption column removing ammonia nitrogen, including tubular carrier, it is characterized in that: be filled with bentonite clay particle section in the stage casing of described tubular carrier, it is separately filled with layer glass layers of balls outside the two ends of described bentonite clay particle section, outside the glass spheres described in two-layer, it is separately filled with layer glass cotton layer, outside the glass cotton layer described in two-layer, is respectively arranged with two fixing plugs.
6. the bentonite clay particle adsorption column of removal ammonia nitrogen according to claim 5, it is characterised in that: described bentonite clay particle section is made up of bentonite clay particle and/or bentone soil particle.
7. the bentonite clay particle adsorption column of removal ammonia nitrogen according to claim 6, it is characterised in that described bentone soil particle is selected from the arbitrary described bentone soil particle of Claims 1-4.
8. the method removing ammonia nitrogen, it is characterized in that: arbitrary for Claims 1-4 described bentonite clay particle removing ammonia nitrogen is dispersed in containing in ammonia nitrogen water, or, the water containing ammonia nitrogen is flowed through the arbitrary described bentonite clay particle adsorption column removing ammonia nitrogen of claim 5 to 7.
9. the method for removal ammonia nitrogen according to claim 8, it is characterised in that: every 4～6g modified alta-mud Granular composite is to 100mL water, and vibrate 1～1.5h, adsorbs.
10. the method for removal ammonia nitrogen according to claim 8, it is characterised in that: the hydraulic detention time of bentonite clay particle adsorption column is 0.8～1.2h.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008221126A (en) * | 2007-03-13 | 2008-09-25 | Hokkaido Univ | Surface modified siliceous shale and water purifying method using the same |
| CN102294226A (en) * | 2011-07-15 | 2011-12-28 | 哈尔滨工业大学 | Preparation method of bamboo charcoal loaded Au-TiO2 composite material and its application |
| CN104591331A (en) * | 2013-10-30 | 2015-05-06 | 南京源泉环保科技股份有限公司 | Method for removing ammonia nitrogen in electroplating wastewater |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008221126A (en) * | 2007-03-13 | 2008-09-25 | Hokkaido Univ | Surface modified siliceous shale and water purifying method using the same |
| CN102294226A (en) * | 2011-07-15 | 2011-12-28 | 哈尔滨工业大学 | Preparation method of bamboo charcoal loaded Au-TiO2 composite material and its application |
| CN104591331A (en) * | 2013-10-30 | 2015-05-06 | 南京源泉环保科技股份有限公司 | Method for removing ammonia nitrogen in electroplating wastewater |
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Application publication date: 20160720 |